the player on the fielding side who stands immediately behind the wicket to stop balls that pass it.
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British Dictionary definitions for wicketkeeper
cricket the player on the fielding side positioned directly behind the wicket
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012